National Biscotti Day is celebrated worldwide every September 29, honoring the delicious Italian cookies known as biscotti, or cantucci. These cookies originated in Prato, Tuscany, and are traditionally made without fat or leavening agents, featuring ingredients like flour, eggs, sugar, pine nuts, and almonds. Biscotti are unique for being twice-baked, resulting in their dry and crunchy texture, making them ideal for dunking in beverages such as coffee, tea, or dessert wine. The first documented recipe dates back to the 18th century, attributed to Italian priest Amadio Baldanzi, while the modern recipe was popularized by pastry chef Antonio Mattei at the International Exposition of 1867 in Paris. To celebrate, people often enjoy biscotti with their coffee or bake their own, experimenting with various flavors and ingredients. Sharing biscotti with friends is encouraged, along with promoting the holiday using hashtags like #NationalBiscottiDay.